This class is called by DBIx::Class::Storage::DBI as a means of collecting statistics on its actions.
Using this class alone merely prints the SQL executed,
the fact that it completes and begin/end notification for transactions.

To really use this class you should subclass it and create your own method for collecting the statistics as discussed in DBIx::Class::Manual::Cookbook.

Sets or retrieves the filehandle used for trace/debug output.
This should be an IO::Handle compatible object (only the print method is used).
Initially should be set to STDERR - although see information on the DBIC_TRACE environment variable.

As getter it will lazily open a filehandle for you if one is not already set.